1 /* $NetBSD: tree.h,v 1.8 2004/03/28 19:38:30 provos Exp $ */
2 /* $OpenBSD: tree.h,v 1.7 2002/10/17 21:51:54 art Exp $ */
6 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
8 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include <sys/cdefs.h>
38 * This file defines data structures for different types of trees:
39 * splay trees and rank-balanced trees.
41 * A splay tree is a self-organizing data structure. Every operation
42 * on the tree causes a splay to happen. The splay moves the requested
43 * node to the root of the tree and partly rebalances it.
45 * This has the benefit that request locality causes faster lookups as
46 * the requested nodes move to the top of the tree. On the other hand,
47 * every lookup causes memory writes.
49 * The Balance Theorem bounds the total access time for m operations
50 * and n inserts on an initially empty tree as O((m + n)lg n). The
51 * amortized cost for a sequence of m accesses to a splay tree is O(lg n);
53 * A rank-balanced tree is a binary search tree with an integer
54 * rank-difference as an attribute of each pointer from parent to child.
55 * The sum of the rank-differences on any path from a node down to null is
56 * the same, and defines the rank of that node. The rank of the null node
59 * Different additional conditions define different sorts of balanced
60 * trees, including "red-black" and "AVL" trees. The set of conditions
61 * applied here are the "weak-AVL" conditions of Haeupler, Sen and Tarjan:
62 * - every rank-difference is 1 or 2.
63 * - the rank of any leaf is 1.
65 * For historical reasons, rank differences that are even are associated
66 * with the color red (Rank-Even-Difference), and the child that a red edge
67 * points to is called a red child.
69 * Every operation on a rank-balanced tree is bounded as O(lg n).
70 * The maximum height of a rank-balanced tree is 2lg (n+1).
73 #define SPLAY_HEAD(name, type) \
75 struct type *sph_root; /* root of the tree */ \
78 #define SPLAY_INITIALIZER(root) \
81 #define SPLAY_INIT(root) do { \
82 (root)->sph_root = NULL; \
83 } while (/*CONSTCOND*/ 0)
85 #define SPLAY_ENTRY(type) \
87 struct type *spe_left; /* left element */ \
88 struct type *spe_right; /* right element */ \
91 #define SPLAY_LEFT(elm, field) (elm)->field.spe_left
92 #define SPLAY_RIGHT(elm, field) (elm)->field.spe_right
93 #define SPLAY_ROOT(head) (head)->sph_root
94 #define SPLAY_EMPTY(head) (SPLAY_ROOT(head) == NULL)
96 /* SPLAY_ROTATE_{LEFT,RIGHT} expect that tmp hold SPLAY_{RIGHT,LEFT} */
97 #define SPLAY_ROTATE_RIGHT(head, tmp, field) do { \
98 SPLAY_LEFT((head)->sph_root, field) = SPLAY_RIGHT(tmp, field); \
99 SPLAY_RIGHT(tmp, field) = (head)->sph_root; \
100 (head)->sph_root = tmp; \
101 } while (/*CONSTCOND*/ 0)
103 #define SPLAY_ROTATE_LEFT(head, tmp, field) do { \
104 SPLAY_RIGHT((head)->sph_root, field) = SPLAY_LEFT(tmp, field); \
105 SPLAY_LEFT(tmp, field) = (head)->sph_root; \
106 (head)->sph_root = tmp; \
107 } while (/*CONSTCOND*/ 0)
109 #define SPLAY_LINKLEFT(head, tmp, field) do { \
110 SPLAY_LEFT(tmp, field) = (head)->sph_root; \
111 tmp = (head)->sph_root; \
112 (head)->sph_root = SPLAY_LEFT((head)->sph_root, field); \
113 } while (/*CONSTCOND*/ 0)
115 #define SPLAY_LINKRIGHT(head, tmp, field) do { \
116 SPLAY_RIGHT(tmp, field) = (head)->sph_root; \
117 tmp = (head)->sph_root; \
118 (head)->sph_root = SPLAY_RIGHT((head)->sph_root, field); \
119 } while (/*CONSTCOND*/ 0)
121 #define SPLAY_ASSEMBLE(head, node, left, right, field) do { \
122 SPLAY_RIGHT(left, field) = SPLAY_LEFT((head)->sph_root, field); \
123 SPLAY_LEFT(right, field) = SPLAY_RIGHT((head)->sph_root, field);\
124 SPLAY_LEFT((head)->sph_root, field) = SPLAY_RIGHT(node, field); \
125 SPLAY_RIGHT((head)->sph_root, field) = SPLAY_LEFT(node, field); \
126 } while (/*CONSTCOND*/ 0)
128 /* Generates prototypes and inline functions */
130 #define SPLAY_PROTOTYPE(name, type, field, cmp) \
131 void name##_SPLAY(struct name *, struct type *); \
132 void name##_SPLAY_MINMAX(struct name *, int); \
133 struct type *name##_SPLAY_INSERT(struct name *, struct type *); \
134 struct type *name##_SPLAY_REMOVE(struct name *, struct type *); \
136 /* Finds the node with the same key as elm */ \
137 static __unused __inline struct type * \
138 name##_SPLAY_FIND(struct name *head, struct type *elm) \
140 if (SPLAY_EMPTY(head)) \
142 name##_SPLAY(head, elm); \
143 if ((cmp)(elm, (head)->sph_root) == 0) \
144 return (head->sph_root); \
148 static __unused __inline struct type * \
149 name##_SPLAY_NEXT(struct name *head, struct type *elm) \
151 name##_SPLAY(head, elm); \
152 if (SPLAY_RIGHT(elm, field) != NULL) { \
153 elm = SPLAY_RIGHT(elm, field); \
154 while (SPLAY_LEFT(elm, field) != NULL) { \
155 elm = SPLAY_LEFT(elm, field); \
162 static __unused __inline struct type * \
163 name##_SPLAY_MIN_MAX(struct name *head, int val) \
165 name##_SPLAY_MINMAX(head, val); \
166 return (SPLAY_ROOT(head)); \
169 /* Main splay operation.
170 * Moves node close to the key of elm to top
172 #define SPLAY_GENERATE(name, type, field, cmp) \
174 name##_SPLAY_INSERT(struct name *head, struct type *elm) \
176 if (SPLAY_EMPTY(head)) { \
177 SPLAY_LEFT(elm, field) = SPLAY_RIGHT(elm, field) = NULL; \
180 name##_SPLAY(head, elm); \
181 __comp = (cmp)(elm, (head)->sph_root); \
183 SPLAY_LEFT(elm, field) = SPLAY_LEFT((head)->sph_root, field);\
184 SPLAY_RIGHT(elm, field) = (head)->sph_root; \
185 SPLAY_LEFT((head)->sph_root, field) = NULL; \
186 } else if (__comp > 0) { \
187 SPLAY_RIGHT(elm, field) = SPLAY_RIGHT((head)->sph_root, field);\
188 SPLAY_LEFT(elm, field) = (head)->sph_root; \
189 SPLAY_RIGHT((head)->sph_root, field) = NULL; \
191 return ((head)->sph_root); \
193 (head)->sph_root = (elm); \
198 name##_SPLAY_REMOVE(struct name *head, struct type *elm) \
200 struct type *__tmp; \
201 if (SPLAY_EMPTY(head)) \
203 name##_SPLAY(head, elm); \
204 if ((cmp)(elm, (head)->sph_root) == 0) { \
205 if (SPLAY_LEFT((head)->sph_root, field) == NULL) { \
206 (head)->sph_root = SPLAY_RIGHT((head)->sph_root, field);\
208 __tmp = SPLAY_RIGHT((head)->sph_root, field); \
209 (head)->sph_root = SPLAY_LEFT((head)->sph_root, field);\
210 name##_SPLAY(head, elm); \
211 SPLAY_RIGHT((head)->sph_root, field) = __tmp; \
219 name##_SPLAY(struct name *head, struct type *elm) \
221 struct type __node, *__left, *__right, *__tmp; \
224 SPLAY_LEFT(&__node, field) = SPLAY_RIGHT(&__node, field) = NULL;\
225 __left = __right = &__node; \
227 while ((__comp = (cmp)(elm, (head)->sph_root)) != 0) { \
229 __tmp = SPLAY_LEFT((head)->sph_root, field); \
232 if ((cmp)(elm, __tmp) < 0){ \
233 SPLAY_ROTATE_RIGHT(head, __tmp, field); \
234 if (SPLAY_LEFT((head)->sph_root, field) == NULL)\
237 SPLAY_LINKLEFT(head, __right, field); \
238 } else if (__comp > 0) { \
239 __tmp = SPLAY_RIGHT((head)->sph_root, field); \
242 if ((cmp)(elm, __tmp) > 0){ \
243 SPLAY_ROTATE_LEFT(head, __tmp, field); \
244 if (SPLAY_RIGHT((head)->sph_root, field) == NULL)\
247 SPLAY_LINKRIGHT(head, __left, field); \
250 SPLAY_ASSEMBLE(head, &__node, __left, __right, field); \
253 /* Splay with either the minimum or the maximum element \
254 * Used to find minimum or maximum element in tree. \
256 void name##_SPLAY_MINMAX(struct name *head, int __comp) \
258 struct type __node, *__left, *__right, *__tmp; \
260 SPLAY_LEFT(&__node, field) = SPLAY_RIGHT(&__node, field) = NULL;\
261 __left = __right = &__node; \
265 __tmp = SPLAY_LEFT((head)->sph_root, field); \
269 SPLAY_ROTATE_RIGHT(head, __tmp, field); \
270 if (SPLAY_LEFT((head)->sph_root, field) == NULL)\
273 SPLAY_LINKLEFT(head, __right, field); \
274 } else if (__comp > 0) { \
275 __tmp = SPLAY_RIGHT((head)->sph_root, field); \
279 SPLAY_ROTATE_LEFT(head, __tmp, field); \
280 if (SPLAY_RIGHT((head)->sph_root, field) == NULL)\
283 SPLAY_LINKRIGHT(head, __left, field); \
286 SPLAY_ASSEMBLE(head, &__node, __left, __right, field); \
289 #define SPLAY_NEGINF -1
292 #define SPLAY_INSERT(name, x, y) name##_SPLAY_INSERT(x, y)
293 #define SPLAY_REMOVE(name, x, y) name##_SPLAY_REMOVE(x, y)
294 #define SPLAY_FIND(name, x, y) name##_SPLAY_FIND(x, y)
295 #define SPLAY_NEXT(name, x, y) name##_SPLAY_NEXT(x, y)
296 #define SPLAY_MIN(name, x) (SPLAY_EMPTY(x) ? NULL \
297 : name##_SPLAY_MIN_MAX(x, SPLAY_NEGINF))
298 #define SPLAY_MAX(name, x) (SPLAY_EMPTY(x) ? NULL \
299 : name##_SPLAY_MIN_MAX(x, SPLAY_INF))
301 #define SPLAY_FOREACH(x, name, head) \
302 for ((x) = SPLAY_MIN(name, head); \
304 (x) = SPLAY_NEXT(name, head, x))
306 /* Macros that define a rank-balanced tree */
307 #define RB_HEAD(name, type) \
309 struct type *rbh_root; /* root of the tree */ \
312 #define RB_INITIALIZER(root) \
315 #define RB_INIT(root) do { \
316 (root)->rbh_root = NULL; \
317 } while (/*CONSTCOND*/ 0)
319 #define RB_ENTRY(type) \
321 struct type *rbe_left; /* left element */ \
322 struct type *rbe_right; /* right element */ \
323 struct type *rbe_parent; /* parent element */ \
326 #define RB_LEFT(elm, field) (elm)->field.rbe_left
327 #define RB_RIGHT(elm, field) (elm)->field.rbe_right
330 * With the expectation that any object of struct type has an
331 * address that is a multiple of 4, and that therefore the
332 * 2 least significant bits of a pointer to struct type are
333 * always zero, this implementation sets those bits to indicate
334 * that the left or right child of the tree node is "red".
336 #define RB_UP(elm, field) (elm)->field.rbe_parent
337 #define RB_BITS(elm, field) (*(__uintptr_t *)&RB_UP(elm, field))
338 #define RB_RED_L ((__uintptr_t)1)
339 #define RB_RED_R ((__uintptr_t)2)
340 #define RB_RED_MASK ((__uintptr_t)3)
341 #define RB_FLIP_LEFT(elm, field) (RB_BITS(elm, field) ^= RB_RED_L)
342 #define RB_FLIP_RIGHT(elm, field) (RB_BITS(elm, field) ^= RB_RED_R)
343 #define RB_RED_LEFT(elm, field) ((RB_BITS(elm, field) & RB_RED_L) != 0)
344 #define RB_RED_RIGHT(elm, field) ((RB_BITS(elm, field) & RB_RED_R) != 0)
345 #define RB_PARENT(elm, field) ((__typeof(RB_UP(elm, field))) \
346 (RB_BITS(elm, field) & ~RB_RED_MASK))
347 #define RB_ROOT(head) (head)->rbh_root
348 #define RB_EMPTY(head) (RB_ROOT(head) == NULL)
350 #define RB_SET_PARENT(dst, src, field) do { \
351 RB_BITS(dst, field) &= RB_RED_MASK; \
352 RB_BITS(dst, field) |= (__uintptr_t)src; \
353 } while (/*CONSTCOND*/ 0)
355 #define RB_SET(elm, parent, field) do { \
356 RB_UP(elm, field) = parent; \
357 RB_LEFT(elm, field) = RB_RIGHT(elm, field) = NULL; \
358 } while (/*CONSTCOND*/ 0)
360 #define RB_COLOR(elm, field) (RB_PARENT(elm, field) == NULL ? 0 : \
361 RB_LEFT(RB_PARENT(elm, field), field) == elm ? \
362 RB_RED_LEFT(RB_PARENT(elm, field), field) : \
363 RB_RED_RIGHT(RB_PARENT(elm, field), field))
366 * Something to be invoked in a loop at the root of every modified subtree,
367 * from the bottom up to the root, to update augmented node data.
370 #define RB_AUGMENT(x) break
373 #define RB_SWAP_CHILD(head, out, in, field) do { \
374 if (RB_PARENT(out, field) == NULL) \
375 RB_ROOT(head) = (in); \
376 else if ((out) == RB_LEFT(RB_PARENT(out, field), field)) \
377 RB_LEFT(RB_PARENT(out, field), field) = (in); \
379 RB_RIGHT(RB_PARENT(out, field), field) = (in); \
380 } while (/*CONSTCOND*/ 0)
382 #define RB_ROTATE_LEFT(head, elm, tmp, field) do { \
383 (tmp) = RB_RIGHT(elm, field); \
384 if ((RB_RIGHT(elm, field) = RB_LEFT(tmp, field)) != NULL) { \
385 RB_SET_PARENT(RB_RIGHT(elm, field), elm, field); \
387 RB_SET_PARENT(tmp, RB_PARENT(elm, field), field); \
388 RB_SWAP_CHILD(head, elm, tmp, field); \
389 RB_LEFT(tmp, field) = (elm); \
390 RB_SET_PARENT(elm, tmp, field); \
392 } while (/*CONSTCOND*/ 0)
394 #define RB_ROTATE_RIGHT(head, elm, tmp, field) do { \
395 (tmp) = RB_LEFT(elm, field); \
396 if ((RB_LEFT(elm, field) = RB_RIGHT(tmp, field)) != NULL) { \
397 RB_SET_PARENT(RB_LEFT(elm, field), elm, field); \
399 RB_SET_PARENT(tmp, RB_PARENT(elm, field), field); \
400 RB_SWAP_CHILD(head, elm, tmp, field); \
401 RB_RIGHT(tmp, field) = (elm); \
402 RB_SET_PARENT(elm, tmp, field); \
404 } while (/*CONSTCOND*/ 0)
406 /* Generates prototypes and inline functions */
407 #define RB_PROTOTYPE(name, type, field, cmp) \
408 RB_PROTOTYPE_INTERNAL(name, type, field, cmp,)
409 #define RB_PROTOTYPE_STATIC(name, type, field, cmp) \
410 RB_PROTOTYPE_INTERNAL(name, type, field, cmp, __unused static)
411 #define RB_PROTOTYPE_INTERNAL(name, type, field, cmp, attr) \
412 RB_PROTOTYPE_INSERT_COLOR(name, type, attr); \
413 RB_PROTOTYPE_REMOVE_COLOR(name, type, attr); \
414 RB_PROTOTYPE_INSERT(name, type, attr); \
415 RB_PROTOTYPE_REMOVE(name, type, attr); \
416 RB_PROTOTYPE_FIND(name, type, attr); \
417 RB_PROTOTYPE_NFIND(name, type, attr); \
418 RB_PROTOTYPE_NEXT(name, type, attr); \
419 RB_PROTOTYPE_PREV(name, type, attr); \
420 RB_PROTOTYPE_MINMAX(name, type, attr); \
421 RB_PROTOTYPE_REINSERT(name, type, attr);
422 #define RB_PROTOTYPE_INSERT_COLOR(name, type, attr) \
423 attr void name##_RB_INSERT_COLOR(struct name *, struct type *)
424 #define RB_PROTOTYPE_REMOVE_COLOR(name, type, attr) \
425 attr void name##_RB_REMOVE_COLOR(struct name *, \
426 struct type *, struct type *)
427 #define RB_PROTOTYPE_REMOVE(name, type, attr) \
428 attr struct type *name##_RB_REMOVE(struct name *, struct type *)
429 #define RB_PROTOTYPE_INSERT(name, type, attr) \
430 attr struct type *name##_RB_INSERT(struct name *, struct type *)
431 #define RB_PROTOTYPE_FIND(name, type, attr) \
432 attr struct type *name##_RB_FIND(struct name *, struct type *)
433 #define RB_PROTOTYPE_NFIND(name, type, attr) \
434 attr struct type *name##_RB_NFIND(struct name *, struct type *)
435 #define RB_PROTOTYPE_NEXT(name, type, attr) \
436 attr struct type *name##_RB_NEXT(struct type *)
437 #define RB_PROTOTYPE_PREV(name, type, attr) \
438 attr struct type *name##_RB_PREV(struct type *)
439 #define RB_PROTOTYPE_MINMAX(name, type, attr) \
440 attr struct type *name##_RB_MINMAX(struct name *, int)
441 #define RB_PROTOTYPE_REINSERT(name, type, attr) \
442 attr struct type *name##_RB_REINSERT(struct name *, struct type *)
444 /* Main rb operation.
445 * Moves node close to the key of elm to top
447 #define RB_GENERATE(name, type, field, cmp) \
448 RB_GENERATE_INTERNAL(name, type, field, cmp,)
449 #define RB_GENERATE_STATIC(name, type, field, cmp) \
450 RB_GENERATE_INTERNAL(name, type, field, cmp, __unused static)
451 #define RB_GENERATE_INTERNAL(name, type, field, cmp, attr) \
452 RB_GENERATE_INSERT_COLOR(name, type, field, attr) \
453 RB_GENERATE_REMOVE_COLOR(name, type, field, attr) \
454 RB_GENERATE_INSERT(name, type, field, cmp, attr) \
455 RB_GENERATE_REMOVE(name, type, field, attr) \
456 RB_GENERATE_FIND(name, type, field, cmp, attr) \
457 RB_GENERATE_NFIND(name, type, field, cmp, attr) \
458 RB_GENERATE_NEXT(name, type, field, attr) \
459 RB_GENERATE_PREV(name, type, field, attr) \
460 RB_GENERATE_MINMAX(name, type, field, attr) \
461 RB_GENERATE_REINSERT(name, type, field, cmp, attr)
463 #define RB_GENERATE_INSERT_COLOR(name, type, field, attr) \
465 name##_RB_INSERT_COLOR(struct name *head, struct type *elm) \
467 struct type *child, *parent; \
468 while ((parent = RB_PARENT(elm, field)) != NULL) { \
469 if (RB_LEFT(parent, field) == elm) { \
470 if (RB_RED_LEFT(parent, field)) { \
471 RB_FLIP_LEFT(parent, field); \
474 RB_FLIP_RIGHT(parent, field); \
475 if (RB_RED_RIGHT(parent, field)) { \
479 if (!RB_RED_RIGHT(elm, field)) { \
480 RB_FLIP_LEFT(elm, field); \
481 RB_ROTATE_LEFT(head, elm, child, field);\
482 if (RB_RED_LEFT(child, field)) \
483 RB_FLIP_RIGHT(elm, field); \
484 else if (RB_RED_RIGHT(child, field)) \
485 RB_FLIP_LEFT(parent, field); \
488 RB_ROTATE_RIGHT(head, parent, elm, field); \
490 if (RB_RED_RIGHT(parent, field)) { \
491 RB_FLIP_RIGHT(parent, field); \
494 RB_FLIP_LEFT(parent, field); \
495 if (RB_RED_LEFT(parent, field)) { \
499 if (!RB_RED_LEFT(elm, field)) { \
500 RB_FLIP_RIGHT(elm, field); \
501 RB_ROTATE_RIGHT(head, elm, child, field);\
502 if (RB_RED_RIGHT(child, field)) \
503 RB_FLIP_LEFT(elm, field); \
504 else if (RB_RED_LEFT(child, field)) \
505 RB_FLIP_RIGHT(parent, field); \
508 RB_ROTATE_LEFT(head, parent, elm, field); \
510 RB_BITS(elm, field) &= ~RB_RED_MASK; \
515 #define RB_GENERATE_REMOVE_COLOR(name, type, field, attr) \
517 name##_RB_REMOVE_COLOR(struct name *head, \
518 struct type *parent, struct type *elm) \
521 if (RB_LEFT(parent, field) == elm && \
522 RB_RIGHT(parent, field) == elm) { \
523 RB_BITS(parent, field) &= ~RB_RED_MASK; \
525 parent = RB_PARENT(elm, field); \
526 if (parent == NULL) \
530 if (RB_LEFT(parent, field) == elm) { \
531 if (!RB_RED_LEFT(parent, field)) { \
532 RB_FLIP_LEFT(parent, field); \
535 if (RB_RED_RIGHT(parent, field)) { \
536 RB_FLIP_RIGHT(parent, field); \
540 sib = RB_RIGHT(parent, field); \
541 if ((~RB_BITS(sib, field) & RB_RED_MASK) == 0) {\
542 RB_BITS(sib, field) &= ~RB_RED_MASK; \
546 RB_FLIP_RIGHT(sib, field); \
547 if (RB_RED_LEFT(sib, field)) \
548 RB_FLIP_LEFT(parent, field); \
549 else if (!RB_RED_RIGHT(sib, field)) { \
550 RB_FLIP_LEFT(parent, field); \
551 RB_ROTATE_RIGHT(head, sib, elm, field); \
552 if (RB_RED_RIGHT(elm, field)) \
553 RB_FLIP_LEFT(sib, field); \
554 if (RB_RED_LEFT(elm, field)) \
555 RB_FLIP_RIGHT(parent, field); \
556 RB_BITS(elm, field) |= RB_RED_MASK; \
559 RB_ROTATE_LEFT(head, parent, sib, field); \
561 if (!RB_RED_RIGHT(parent, field)) { \
562 RB_FLIP_RIGHT(parent, field); \
565 if (RB_RED_LEFT(parent, field)) { \
566 RB_FLIP_LEFT(parent, field); \
570 sib = RB_LEFT(parent, field); \
571 if ((~RB_BITS(sib, field) & RB_RED_MASK) == 0) {\
572 RB_BITS(sib, field) &= ~RB_RED_MASK; \
576 RB_FLIP_LEFT(sib, field); \
577 if (RB_RED_RIGHT(sib, field)) \
578 RB_FLIP_RIGHT(parent, field); \
579 else if (!RB_RED_LEFT(sib, field)) { \
580 RB_FLIP_RIGHT(parent, field); \
581 RB_ROTATE_LEFT(head, sib, elm, field); \
582 if (RB_RED_LEFT(elm, field)) \
583 RB_FLIP_RIGHT(sib, field); \
584 if (RB_RED_RIGHT(elm, field)) \
585 RB_FLIP_LEFT(parent, field); \
586 RB_BITS(elm, field) |= RB_RED_MASK; \
589 RB_ROTATE_RIGHT(head, parent, sib, field); \
592 } while ((parent = RB_PARENT(elm, field)) != NULL); \
595 #define RB_GENERATE_REMOVE(name, type, field, attr) \
597 name##_RB_REMOVE(struct name *head, struct type *elm) \
599 struct type *child, *old, *parent, *right; \
602 parent = RB_PARENT(elm, field); \
603 right = RB_RIGHT(elm, field); \
604 if (RB_LEFT(elm, field) == NULL) \
605 elm = child = right; \
606 else if (right == NULL) \
607 elm = child = RB_LEFT(elm, field); \
609 if ((child = RB_LEFT(right, field)) == NULL) { \
610 child = RB_RIGHT(right, field); \
611 RB_RIGHT(old, field) = child; \
612 parent = elm = right; \
616 while ((child = RB_LEFT(elm, field)) != NULL); \
617 child = RB_RIGHT(elm, field); \
618 parent = RB_PARENT(elm, field); \
619 RB_LEFT(parent, field) = child; \
620 RB_SET_PARENT(RB_RIGHT(old, field), elm, field);\
622 RB_SET_PARENT(RB_LEFT(old, field), elm, field); \
623 elm->field = old->field; \
625 RB_SWAP_CHILD(head, old, elm, field); \
627 RB_SET_PARENT(child, parent, field); \
628 if (parent != NULL) \
629 name##_RB_REMOVE_COLOR(head, parent, child); \
630 while (parent != NULL) { \
631 RB_AUGMENT(parent); \
632 parent = RB_PARENT(parent, field); \
637 #define RB_GENERATE_INSERT(name, type, field, cmp, attr) \
638 /* Inserts a node into the RB tree */ \
640 name##_RB_INSERT(struct name *head, struct type *elm) \
643 struct type *parent = NULL; \
645 tmp = RB_ROOT(head); \
648 comp = (cmp)(elm, parent); \
650 tmp = RB_LEFT(tmp, field); \
652 tmp = RB_RIGHT(tmp, field); \
656 RB_SET(elm, parent, field); \
657 if (parent == NULL) \
658 RB_ROOT(head) = elm; \
660 RB_LEFT(parent, field) = elm; \
662 RB_RIGHT(parent, field) = elm; \
663 name##_RB_INSERT_COLOR(head, elm); \
664 while (elm != NULL) { \
666 elm = RB_PARENT(elm, field); \
671 #define RB_GENERATE_FIND(name, type, field, cmp, attr) \
672 /* Finds the node with the same key as elm */ \
674 name##_RB_FIND(struct name *head, struct type *elm) \
676 struct type *tmp = RB_ROOT(head); \
679 comp = cmp(elm, tmp); \
681 tmp = RB_LEFT(tmp, field); \
683 tmp = RB_RIGHT(tmp, field); \
690 #define RB_GENERATE_NFIND(name, type, field, cmp, attr) \
691 /* Finds the first node greater than or equal to the search key */ \
693 name##_RB_NFIND(struct name *head, struct type *elm) \
695 struct type *tmp = RB_ROOT(head); \
696 struct type *res = NULL; \
699 comp = cmp(elm, tmp); \
702 tmp = RB_LEFT(tmp, field); \
705 tmp = RB_RIGHT(tmp, field); \
712 #define RB_GENERATE_NEXT(name, type, field, attr) \
715 name##_RB_NEXT(struct type *elm) \
717 if (RB_RIGHT(elm, field)) { \
718 elm = RB_RIGHT(elm, field); \
719 while (RB_LEFT(elm, field)) \
720 elm = RB_LEFT(elm, field); \
722 if (RB_PARENT(elm, field) && \
723 (elm == RB_LEFT(RB_PARENT(elm, field), field))) \
724 elm = RB_PARENT(elm, field); \
726 while (RB_PARENT(elm, field) && \
727 (elm == RB_RIGHT(RB_PARENT(elm, field), field)))\
728 elm = RB_PARENT(elm, field); \
729 elm = RB_PARENT(elm, field); \
735 #define RB_GENERATE_PREV(name, type, field, attr) \
738 name##_RB_PREV(struct type *elm) \
740 if (RB_LEFT(elm, field)) { \
741 elm = RB_LEFT(elm, field); \
742 while (RB_RIGHT(elm, field)) \
743 elm = RB_RIGHT(elm, field); \
745 if (RB_PARENT(elm, field) && \
746 (elm == RB_RIGHT(RB_PARENT(elm, field), field))) \
747 elm = RB_PARENT(elm, field); \
749 while (RB_PARENT(elm, field) && \
750 (elm == RB_LEFT(RB_PARENT(elm, field), field)))\
751 elm = RB_PARENT(elm, field); \
752 elm = RB_PARENT(elm, field); \
758 #define RB_GENERATE_MINMAX(name, type, field, attr) \
760 name##_RB_MINMAX(struct name *head, int val) \
762 struct type *tmp = RB_ROOT(head); \
763 struct type *parent = NULL; \
767 tmp = RB_LEFT(tmp, field); \
769 tmp = RB_RIGHT(tmp, field); \
774 #define RB_GENERATE_REINSERT(name, type, field, cmp, attr) \
776 name##_RB_REINSERT(struct name *head, struct type *elm) \
778 struct type *cmpelm; \
779 if (((cmpelm = RB_PREV(name, head, elm)) != NULL && \
780 cmp(cmpelm, elm) >= 0) || \
781 ((cmpelm = RB_NEXT(name, head, elm)) != NULL && \
782 cmp(elm, cmpelm) >= 0)) { \
783 /* XXXLAS: Remove/insert is heavy handed. */ \
784 RB_REMOVE(name, head, elm); \
785 return (RB_INSERT(name, head, elm)); \
793 #define RB_INSERT(name, x, y) name##_RB_INSERT(x, y)
794 #define RB_REMOVE(name, x, y) name##_RB_REMOVE(x, y)
795 #define RB_FIND(name, x, y) name##_RB_FIND(x, y)
796 #define RB_NFIND(name, x, y) name##_RB_NFIND(x, y)
797 #define RB_NEXT(name, x, y) name##_RB_NEXT(y)
798 #define RB_PREV(name, x, y) name##_RB_PREV(y)
799 #define RB_MIN(name, x) name##_RB_MINMAX(x, RB_NEGINF)
800 #define RB_MAX(name, x) name##_RB_MINMAX(x, RB_INF)
801 #define RB_REINSERT(name, x, y) name##_RB_REINSERT(x, y)
803 #define RB_FOREACH(x, name, head) \
804 for ((x) = RB_MIN(name, head); \
806 (x) = name##_RB_NEXT(x))
808 #define RB_FOREACH_FROM(x, name, y) \
810 ((x) != NULL) && ((y) = name##_RB_NEXT(x), (x) != NULL); \
813 #define RB_FOREACH_SAFE(x, name, head, y) \
814 for ((x) = RB_MIN(name, head); \
815 ((x) != NULL) && ((y) = name##_RB_NEXT(x), (x) != NULL); \
818 #define RB_FOREACH_REVERSE(x, name, head) \
819 for ((x) = RB_MAX(name, head); \
821 (x) = name##_RB_PREV(x))
823 #define RB_FOREACH_REVERSE_FROM(x, name, y) \
825 ((x) != NULL) && ((y) = name##_RB_PREV(x), (x) != NULL); \
828 #define RB_FOREACH_REVERSE_SAFE(x, name, head, y) \
829 for ((x) = RB_MAX(name, head); \
830 ((x) != NULL) && ((y) = name##_RB_PREV(x), (x) != NULL); \
833 #endif /* _SYS_TREE_H_ */